Miramar shows this tug as being built by Mitchison, Gateshead, but the listing of builds from P K Harris, Appledore, shows her built there in 1959. She certainly looks a typical Harris hydroconic tug of the era.

Does anybody have a yard list from Mitchison, showing her yard number there?

There's also another very similar design tug, Sirius Cove, from the same time, that Miramar shows as a Mitchison build. Yard listing would show that as well.

I knew that Mitchison built trawlers to the Burness and Corlett hydroconic design, but not tugs.